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                    <h1>深浅拷贝</h1>
                    
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                            2016-04-28
                        
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                <figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">//严谨的校验数据类型 Object.prototype.toString.call(a) </div><div class="line">if (Object.prototype.toString.call(d) === &apos;[object Array]&apos;) &#123;</div><div class="line">      console.log(&apos;d 是一个数组&apos;)</div><div class="line">    &#125;</div></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line">// 浅拷贝，或者说叫做浅复制</div><div class="line">    for(var key in obj) &#123;</div><div class="line">      // obj1[&apos;b&apos;] = obj[&apos;b&apos;]</div><div class="line">      // 解决方法：判断如果 obj[&apos;b&apos;] 是数组的话，则先让 obj1 生成一个数组 obj1[&apos;b&apos;] = []</div><div class="line">      // 然后再遍历 obj[&apos;b&apos;] 把数组的数据复制到 obj[&apos;b&apos;] 数组中</div><div class="line">      obj1[key] = obj[key]</div><div class="line">    &#125;</div></pre></td></tr></table></figure>
<pre><code><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div></pre></td><td class="code"><pre><div class="line">//实现深拷贝，利于递归</div><div class="line">var obj = &#123;</div><div class="line">      foo: &apos;bar&apos;,</div><div class="line">      a: 1,</div><div class="line">      b: [1, 2, 3],</div><div class="line">      c: &#123;</div><div class="line">        foo: &quot;bar&quot;</div><div class="line">      &#125;</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    // 最简单的深拷贝</div><div class="line">    // 缺点：浏览器兼容性</div><div class="line">	</div><div class="line">Feature	        Chrome	       Firefox (Gecko)	        Internet       Explorer	      Opera      Safari</div><div class="line">Basic        support	(Yes)	       3.5 (1.9.1)	            8.0	         10.5	   4.0</div><div class="line">    // var obj1 = JSON.parse(JSON.stringify(obj))</div><div class="line"></div><div class="line">    var obj1 = &#123;&#125;</div><div class="line"></div><div class="line">    extend(obj1, obj)</div><div class="line"></div><div class="line">    console.log(obj1, obj)</div><div class="line"></div><div class="line">    function isObject(obj) &#123;</div><div class="line">      return Object.prototype.toString.call(obj) === &apos;[object Object]&apos;</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    function isArray(obj) &#123;</div><div class="line">      return Object.prototype.toString.call(obj) === &apos;[object Array]&apos;</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    // 利用递归实现深拷贝对象复制</div><div class="line">    function extend(target, source) &#123;</div><div class="line">      for(var key in source) &#123;</div><div class="line">        // 判断如果当前遍历项 source[key] 是一个数组，则先让 target[key] = 数组</div><div class="line">        // 然后遍历 source[key] 将其中的每一项都复制到 target[key] 中</div><div class="line">        if (isArray(source[key])) &#123;</div><div class="line">          target[key] = []</div><div class="line">          // 遍历 source[key] 复制到 target[key] 中</div><div class="line">          extend(target[key], source[key])</div><div class="line">        &#125; else if (isObject(source[key])) &#123;</div><div class="line">          target[key] = &#123;&#125;</div><div class="line">          extend(target[key], source[key])</div><div class="line">        &#125; else &#123;</div><div class="line">          target[key] = source[key]</div><div class="line">        &#125;</div><div class="line">        // target[key] = source[key]</div><div class="line">      &#125;</div><div class="line">    &#125;</div></pre></td></tr></table></figure>
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